Improved floating- dock



intended to have a pressure-ga.uge, S, divided, not` in l pounds,.but infeet and inches, showing the head of water corresponding to thepressure,

Bythis arrangement, when one of the small pipes has received, throughits tap, a suilcient supply of air from the reservc ir, its

' gauge will indicate the head of water above its lower extremity.

T represents the air-pump, by which air is conipressed in the reservoirI. l By making the reservoir suieiently large in proportion, tethecap'acity of the lsmall pipes, and taking reasonable care to avoidleakage and waste, no inconi venient 'anionntof pumping ot' air into thereservoir,

will be required, eitherduring th'e docking or undocking. v i i Itispreferred that each side ot tue dock should have its reservoir andpipes, all the gauges on either side being together in va small officefor the purpose.

Ddimription of the Drawings.

No shores-have been shown on the drawings, to

avoid confusion.

Figures 1 to 5,

adaptedvjo vessels Eclipse class. u

Figure 1 isa sectional elevation through the centre inclusive, representthe tray as of the unarmored screw-sloop ofltlav,

or' which there are thirty-eight, D, the water-tight keel, E and E arethe longitudinal girders, and F F, the cutwaters. The deck Gr issupported on the transverse ribs A- and C, which the outer or upperedges. The draught ot' this tray, with the uuarmored screw-sloop Eclipsei at her load displacement of one thousand `eight hundred tous' on itvary from 7 0 toS 9", according to the lquantity of water admittedforward and aft for trimming.

Figures 6' to 10, inclusive, represent tlie dockl as adapted for th'elarge 'trays,'the tray shown being snit able forV the IndiantransportEuphrates.

li'igure 6 is a sectional elevation through the centre of the dock. f v

Figure 'i isa plan.

Figure 8 is a transverse section,.showing the vessel grounded on theblocks of the tray. I

Figure 9 is'a section showing the traylifted up and drained out. l i

Figure 10 is a section showing the trayfloating oil', f

with the vessel on it.

The letters of reference on this tray indicate-corresponding part-s tothose in rigs. 1 to 5 inclusive.

The tray is composed of twenty-one' water-tight transverse ribs,makingforty water-tight compartments, twenty on each side of `the keel,and sixty-twoy transverse ribs.

The draught of this tray, with the Indian transport Ifluphrates at lierload displacement of six thousandtwo hundred and eleven touson it, varyfrom 10' tol 12' 8", according to the quantity of water admitted forwardand aft for trimming. 'i

I is the doek, which is composed of a water-tight keel and twcnty-sevenwater-tight bulkheads, making l the tank is shown'six feet Y joint ;Y MM are the transverse bulkheads .in the tanks; Y l N N is. the wood-workof thelwater-tight joints; and O O, the India rubber for the same.`

fifty-tivo water -tight compartments, twenty-six ou each side of thekeel. J J are thecutwaters.

Figures 1l to 14, inclusive, represent the same dock, showing'itscapability of taking-the larger class of vessels, such as the Minotaur,over shallows.

Figure 11 isa sectional elevation.

Figure 12 is a plan.

Figure 13 is a transverse section, showing the vessel ounded on theblocks of the dock.

Figure 14 is a section showing the vessel lifted up, ready for beingtaken over shallows.

. The draught 'of the dock, with the iron-clad Mind taur at her loaddisplacement of ten thonsandtwo hundred and thirty tous on it, isl" 7".

Figures 15 to 18, inclusive, represent a dock suitable for dockingriver-Steamers oi'Iligbt draught.

Figure 15is a sectional elevation. Figure 16 is a plan. Figure 17 is atransverse section, showing the vessel grounded onthe blocks ofthe dock.

Figure, 18 is a section showing the vessel lifted up:`

This dock is composed of forty-two water-tight compartments, twenty-oneon each side of the keel.

Figures 19`to 22, inclusive, represent an iron belt,

K,`for repairing the dock.

Figure 19 is a sectional elevation. Figure'20is a plan. Figure'21isajtransvelse sect-ion, to a larger scale. L L are the tanks at thelends. Jlhe. under side oi' lower than the water-tight Figure 23represents the water-gauge, composed of reservoir P, small pipes Q,separate compartments R,-

pressure-gauge S, and air-pump 'L v 1. In combinationwith the deck ofatray or pon-' toon fof supporting a vessel shored thereon, the lowertransversel ribs,'supporting Ithe deck, and dividing the hull intoseveral water-'tight compartments, andthe ,upper transverse water-tightbulkheads, above the y deck, substantially as described. i

`2. Also, a tray or pontoon, distinguished from a floating'dock, forcarrying vessels, withtheir cargoes,

over shoals, with cutwaters tofacilitate `the tewing thereof,substantially as described. u

3'. Also, a floating dock,` ith only two sets oi waterchamberstransversely, one seton eachside of a longitudinal centre partition,thusA4 dispensing with the upper or load-chambers andthe lower orair-chambers dei scribed in my saidformer patent, thesame beingconstrncted substantially as herein described.

. '4. yAsian improvement upon the belt described in my said r formerpatent, to facilitate the repairing of docks' or trays, the large endtanks,'with'one or more transverse water-tight lliulkheads` iu each,substantially as.

described.

`. 'lhccombiuation and arrangemeutot' reservoir u P, pipes Q, gauge S,and air-pump T, 'substantially as and for the purpose herein set forth.

- The above specification of my invention signed by` `me, this .1'st dayof July, 1 868.

. JAMES CAMPBELL.

`Witnesses: l

J. CoMBs, Solr. Staple Inn, JOHN L. HALL, Dfraughtsman,

l 6- Founders Court, `Lothbury.

